Leaders of two of the biggest USPS unions are skeptical with the appointment, as the future of the courier remains up in the air.

Steiner will replace Louis DeJoy, whom resigned from the position in March, as well as current Acting Postmaster General Doug Tulino, whom USPS said will resume his role as Deputy Postmaster General and Chief Human Resources Officer.

The US Postal Service Board of Governors announced Friday that David Steiner, a board member at FedEx, will be the next postmaster general – a move that comes amid concerns the Trump administration will push for privatization of the mail delivery service,